package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.util.StreamUtils;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

//@RestController
//@RequestMapping("/common")
//@Slf4j
public class CommonController {
    @Value("${reggie.path}")
    private String basePath;

    //上传
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        //file是临时文件,如果不转存到指定位置,本次请求完成后会被删除
        //log.info(file.toString());

        //原始文件名
        String originalFilename = file.getOriginalFilename();
        //获取指定字符或者字符串最后一次出现的位置
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

        //使用UUID随机生成文件名,防止重复造成覆盖
        String filrName = UUID.randomUUID().toString() + suffix;

        //创建一个目录对象
        File dir = new File(basePath);

        //判断当前目录是否存在
        if (!dir.exists()){
            //如果不存在则创建
            dir.mkdirs();
        }

        try {
            //将临时文件转存到指定位置
            file.transferTo(new File(basePath + filrName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(filrName);
    }

    //下载
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            //输入流
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
            //输出流
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");

            //直接进行对拷
            StreamUtils.copy(fileInputStream,outputStream);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
